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References
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This work was supported by NRC Grant A-7262 and A-3127. Some of the results of this paper were presented during the Tenth International Conference on Functional Equations at Oberwolfach (Germany, July 30–August 5, 1972).
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Światak, H. On a class of functional equations with several unknown functions. Aeq. Math. 12, 39–64 (1975). https://doi.org/10.1007/BF01834037
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DOI: https://doi.org/10.1007/BF01834037